* [http://nic-nac-project.de/~kaosmos/index-en.html#nrrh New Return Receipt Handler Extension] by Nic Nac Project
** [http://nic-nac-project.de/~kaosmos/returnreceipt.png NRRHE screenshot]
* [http://www.eyrich-net.org/mozilla/X-Mozilla-Status.html?en X-Mozilla-Status explained]
== Relevant Bugs ==